Philip a



(No Model.)

P. A OTIS.

GRINDING MAGHINERY.

Patented July 6, 18 86.

IINTTTD STATES PATENT .Orrrcn.

PHILIP A. OTIS, OF LEEDS, MASSACHUSETTS, ASSIGNOR TO THE NORTH AMPTON EMERY WHEEL COMPANY, OF SAME PLACE.

GRINDING MACHINERY.

BPEGIFICATION forming part of Letters Patent No. 344,919, dated July 6, 1886.

Application filed Dcecmber24,1885. Serial No.186,619. (No model.)

To ctZZ whom it may concern.-

Be it known that I, PHILIP A. OTIS, of Leeds, in the county of Hampshire and State of Massachusetts, have invented a certain new and useful Improvement pertaining to Grinding Machinery, of which the following is a specification, reference being had to the accompanying drawings, where Figure l is a view of my embodied improvement, which may be called a top View. Fig. 2 is an end view of the same-a view of the front end or working end. Fig. 3 is a rear end view of the same. Fig. 4. is a view of the same in central vertical section, taken on the line at a" of Fig. 3.

This improvement pertains to the use of hollow cylindrical grinding-wheels, (emerywheels, for instance,) in the use of which the grinding is done on what may be called the end of the cylinder-a process that is illustrated and described in the Letters Patent of John L. Otis, for improvement in grindingmachines, No. 182,284, dated September 19, 1.876. In the patent just referred to the grindingwheel is a so-callec emery-wheel, and is cnp-shaped-that is, it is a hollow cylinder with one closed end, the whole of which is made up of emery compound. The use of the improvement herein described enables me to dispense with closing the end of the grindingcylinder, thereby saving considerable material and expense. It further enables me to make the grinding-cylinder of less thickness than before, and, still further, enables me to use a much higher speed of rotation for the grinding-eylinder than would otherwise be prac ticable.

In the accompanying drawings, the letter a denotes a hollow cylind rical grinding-wheel, which is (or at least maybe) open at both ends. This grinding-wheel fits within a separate hollow metallic cylinder, 6, and in use projects therefrom somewhat. The protecting-cylinder 1) is radially expansible and contractible; this capacity being mainly given by the slots 0. To this end the protectingcylinder b bears exteriorly the screw-thread d, on which runs the adjusting-ring e, interiorly threaded for that purpose, and the protecting-cylinder is contracted or expanded for grasping or loosing the grinding-wheel by rotating the adj usting-ring e backward or forward on the screwthread d. As the edge or grinding-face of the grinding-whee] wears away by use it must, of course, be fed laterally to compensate therefor. To'this end there is within the protecting-cylinder b, and back of the grinding-cylinder, a sectionally-divided ring, f. Each of the sections is hung upon a threaded shaft, 9, running through and journaled in the disk part of the protecting-cylinder and rearward thereoflbearing a pinion, h, meshing into a gear, 2', by the rotating of which gear the sectionally-divided ring is advanced or retreated, as desired. This arrangement, just described, of the sectionally divided ring, threaded shafts, pinions, and gear, constitutes an adjustable feeding device for the grindingwheel. The disk part of the protecting-cylinder I) is central] y perforated. This perforation is threaded and intended to be screwed upon a rapidly-rotating shaft, which, of course, will give rapid rotation to the protecting-cylinder and to the grinding-cylinder.

I claim as my improvement 1. In combination, the sectionally-divided ring 7, the threaded shaftsg, the pinions h, the gears 13, and the supporting-oylinderb, all substantially as described, and for the purpose set forth.

2. In combination, the hollow and exteriorlythreaded supporting-cylinder I), theinteriorlythreaded ring 0, the sectionallydivided ring 7, the threaded shafts g, the pinions h, and the gears r, all substantially as described, and for the purpose set forth.

PHILIP A. OTIS.

WVitnesses:

A. O. TANNER, H. R. WILLIAMS. 

